(a) Suffering from mental or physical illness of such character as to render the person afflicted incapable of managing himself, his affairs or the affairs of others with the integrity and competence requisite for the proper practice of law;

(b) Active misfeasance or repeated neglect of duty in respect to the affairs of a client, whether in matters pending before a tribunal or in other matters constituting the practice of law; or

(c) Habitual use of alcoholic beverages or liquids of any alcoholic content, hallucinogens, sedatives, drugs, or other mentally or physically disabling substances of any character whatsoever to any extent which impairs or tends to impair ability to conduct efficiently and properly the affairs undertaken for a client in the practice of law.